Ballistic plate.



SAMUEL S. WALES, OF MUNHALL, PE

OF PITTSBURG, PENNSYLVANIA,

NNSYLVA NIA, ASSIGNO-R rro oanunem STEELOOMPANY, A CORPORATION or NEw'mRsEY.

'BALLISTIG 'rLArE.

Specification of Letters Patent.

Patented July20, 1909.

Application filed December 88,1907. Serial No, 407,!

To all whom it may concern:

Be it known that I, SAMUEL S. WALES, of Munhall, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Ballistic Plates, of which the following is a full, clear, and exact description.

My invention relates to ballistic plates either with or without a carburized face.

The object of the invention is to provide a new alloy which will give a plate of high ballistic resistance and great resistance and toughness in the body of the late.

In my application Serial 0. 383,687, filed July 13th, 1907, I have disclosed an armor plate alloy which contains nickel, chromium, and vanadium below one per cent. I have now found that a nickel armor plate can be greatly improved by the use of tungsten and vanadium, both below one per cent. Where the chromium is omitted entirely.

i In carrfyin'g out my process in the manufacture-o either face-hardened armor plate or protected deck plates,.I use an alloy, of which I. have found the following to be best suited for the pur ose, although other elements may be a ded to those specified,

or the proportions varied within certain limits :carbon,' .10 to .50; per cent; manganese, .25 to .40 per cent; nickel, 3 to 10 per cent; tungsten, .50 to l per cent.; vanadium, .15 to .50 per cent.

The steel which @I employ is preferably open hearth steel, and I nickel as apart of the charge of the furnace in a cold condition. The tungsten and vana dium are preferably added in a molten condition, preferably as ferro-alloys, to the open hearth ladle as the heat is tapped thereinto. The pro ortion of carbon may be produced by recar urizing in the usual manner. The silicon contents of the steel should be low,

preferably less than .15 percent. The sulfur :found to intensify the action of this element.

should be as low as possible, preferably less than .04 per cent. t is important in this vanadium allo that the phosphorus should be extremely ow because the vanadium is The phosphorus should, therefore, not eatcee'd .04 per cent. In some cases present alloy as recited, in amounts below one per cent. The method of introducing prefer to add the I may substitute molybdl;

num as an equivalent for the tungsten or a part thereof, in varyin amounts up to one per cent., or I may ad molybdenum to the cent.; substantifally;fi1d ib d the nickel and'm'aking the additions may remain the same as above stated.

The ballistic armor or vault late. ro-

duced from this alloy may be en jeote to.

any well-known armor'plate treatment, and ma be face-hardened or not as desired;

he advan'ta es of my invention result from the use 0 the elements, nickel, tungsten, and vanadium. Thecombination of the tungsten and vanadium in thearmor pear to increaset'he' toughness and strengt without material] .de'creasin the elongation. By theword tungsten? intend to cover either tungsten or an equiva-- lent'thereof, for performing the same fu'nc tions as referred to-herein.'

Many variations may be made in the proportions ofthe elements, in the heat treatments, &c., without departing from my invention.

.By the term tungsten? in my claims, I

intend to. cover tungsten-or its functional equivalents for the purpose.

1. As a new article of manufacture, a

ballistic, armor, or vault steel plate free from chromium, and containin tungsten, and -be low one per cent. of vana ium; substantially as described.

2. As a new article of manufacture, a ballistic, armor, or vault steel plate free from chromium, and -containing tungsten, nlekel,

and below ,one per cent. of vanadium; sub- 'stantially as described.

3. As a new article of manufacture, a bail-- listic, armor, or vault steel plate. free. from chromium, and-containing below one per cent., nickel, and below one; per cent. of vanadium; substantially as described.

4. Asa new article of manufacture, a ballistic, armor, or vault steel plate free from chromium, and containing tungsten, nickel above two per cent., andbelow one or cent. of vanadium; substantially asxdescrl ed.

5. As a new article of manufacture,- a ballistic, armor, or-vault steel plate free from chromium, and containing tungsten below one per cent., nickel from three to ten cent., and below one per cent. of vanadium;

substantially as described.

105. 6, As a new article of manufacture, listic, armor, or vault steel plate free chromium, and containing, tungsten, nickel, molybdenumandivanadium below. one per 1'10 Q esasee 7 As a new article of manufacture, a ballistic, armor, or vault steel plate free from chromium, and containing tungsten, nickel, and molybdenum below one per cent, and vanadium below one per cent.; substantially as described.

8. As a new article of manufacture, a ballistic, armor, or vault steel plate freefrom chromium, and containing tungsten below 10 one per cent, molybdenum below one per cent, three to ten per cent. of nickel and be low one er cent. of vanadium; substantially as descri ed.

In testimony whereof, I have hereunto set my hand.

s. s. WALES,

Witnesses:

JOHN MILLER, H. M.- CORWIN. 

